First of all, you can't lose fat in specific places on the body. Forget that.
Secondly, don't focus on losing weight, but on losing fat!
The obvious ways:
- Not eating more than your body needs. But eating far too little will be counter-productive in the long run, as your body will compensate by slowing down metabolism, which means that when you start eating too much again, you'll gain more fat than ever! Plus, you will also have lost muscle tissue, and you don't want that.
- Eat more healthy food, especially non-processed foods that will force the body to do some work in order to break it down. That means brown rice, not french fries from McDonalds, for instance. Rule of thumb: The less processed the better. + Eat healthy fats like omega 3.
- Exercise! Contrary to popular belief, weight training is a very good way to lose fat. Building muscle will accelerate metabolism which means that you can eat more without gaining fat. While muscles weigh more than fat, they take less space than fat so you'll look (and will be) slimmer! And don't worry about looking like a body builder, a woman must use steroids for that to happen. A combination of weight training and running/spinning/aerobic/whatever is optimal.
